Add checks for Python and uv dependencies in build process

dotnet/Directory.Build.targets

@@ -10,4 +10,23 @@
     <None Include="$(ReadMePath)" Pack="true" PackagePath="\" />
   </ItemGroup>
 
+  <PropertyGroup>
+    <!-- Optional flag, defaults to false -->
+    <InstallMissingTools Condition="'$(InstallMissingTools)' == ''">false</InstallMissingTools>
+  </PropertyGroup>
+
+  <Target Name="CheckPrereqs" BeforeTargets="Build">
+    <Exec Condition=" '$(OS)' == 'Windows_NT' and '$(InstallMissingTools)' == 'true' "
+          Command="powershell -ExecutionPolicy Bypass -File $(MSBuildThisFileDirectory)eng\check-prereqs.ps1 -InstallMissing" />
+
+    <Exec Condition=" '$(OS)' == 'Windows_NT' and '$(InstallMissingTools)' != 'true' "
+          Command="powershell -ExecutionPolicy Bypass -File $(MSBuildThisFileDirectory)eng\check-prereqs.ps1" />
+
+    <Exec Condition=" '$(OS)' != 'Windows_NT' and '$(InstallMissingTools)' == 'true' "
+          Command="bash $(MSBuildThisFileDirectory)eng/check-prereqs.sh --install-missing" />
+
+    <Exec Condition=" '$(OS)' != 'Windows_NT' and '$(InstallMissingTools)' != 'true' "
+          Command="bash $(MSBuildThisFileDirectory)eng/check-prereqs.sh" />
+  </Target>
+
 </Project>

dotnet/eng/check-prereqs.ps1

@@ -0,0 +1,69 @@
+param (
+    [switch]$InstallMissing
+)
+
+$ErrorActionPreference = "Stop"
+$Missing = @()
+
+function Check-Command {
+    param ([string]$Name)
+    if (-not (Get-Command $Name -ErrorAction SilentlyContinue)) {
+        Write-Host ("Missing: {0,-10} - not found in PATH" -f $Name)
+        $script:Missing += $Name
+    }
+    else {
+        Write-Host ("Found:   {0,-10}" -f $Name)
+    }
+}
+
+function Install-Tool {
+    param ([string]$Tool)
+    Write-Host "Installing $Tool..."
+
+    switch ($Tool) {
+        "python" {
+            if (Get-Command winget -ErrorAction SilentlyContinue) {
+                winget install -e --id Python.Python.3
+            }
+            elseif (Get-Command choco -ErrorAction SilentlyContinue) {
+                choco install python3 -y
+            }
+            else {
+                Write-Host "No supported package manager (winget or choco) found."
+                exit 1
+            }
+        }
+        "uv" {
+            Invoke-WebRequest -Uri "https://astral.sh/uv/install.ps1" -UseBasicParsing | Invoke-Expression
+        }
+        default {
+            Write-Host "No install logic defined for: $Tool"
+            exit 1
+        }
+    }
+}
+
+Write-Host "Checking for required tools..."
+Check-Command python
+Check-Command uv
+
+if ($Missing.Count -gt 0) {
+    Write-Host "`nMissing tools detected: $Missing"
+
+    if ($InstallMissing) {
+        foreach ($tool in $Missing) {
+            Install-Tool $tool
+        }
+        Write-Host "`nAll missing tools installed."
+    }
+    else {
+        Write-Host "`nSome required tools are missing. Re-run with '--install-missing' to install them."
+        Write-Host ""
+            Write-Host "For manual setup instructions, see:"
+            Write-Host "https://github.com/microsoft/autogen/blob/main/python/README.md#setup"
+        exit 1
+    }
+}
+else {
+    Write-Host "`nAll required tools are installed."
+}

dotnet/eng/check-prereqs.sh

@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+MISSING=()
+INSTALL=false
+
+if [[ "${1:-}" == "--install-missing" ]]; then
+  INSTALL=true
+fi
+
+check_command() {
+  local name=$1
+  if ! command -v "$name" &>/dev/null; then
+    printf "Missing: %-10s - not found in PATH\n" "$name"
+    MISSING+=("$name")
+  else
+    printf "Found:   %-10s\n" "$name"
+  fi
+}
+
+install_tool() {
+  local tool=$1
+  echo "Installing $tool..."
+  case "$tool" in
+    python3)
+      if command -v brew &>/dev/null; then
+        brew install python
+      elif command -v apt &>/dev/null; then
+        sudo apt update && sudo apt install -y python3
+      elif command -v dnf &>/dev/null; then
+        sudo dnf install -y python3
+      else
+        echo "Unsupported package manager. Please install $tool manually."
+        return 1
+      fi
+      ;;
+    uv)
+      curl -Ls https://astral.sh/uv/install.sh | sh
+      ;;
+    *)
+      echo "No install method defined for: $tool"
+      return 1
+      ;;
+  esac
+}
+
+echo "Checking for required tools..."
+check_command python3
+check_command uv
+
+if [ ${#MISSING[@]} -ne 0 ]; then
+  echo ""
+  echo "Missing tools detected: ${MISSING[*]}"
+
+  if [ "$INSTALL" = true ]; then
+    for tool in "${MISSING[@]}"; do
+      install_tool "$tool"
+    done
+    echo "All missing tools have been installed."
+  else
+    echo "Some required tools are missing. Use '--install-missing' to install them automatically."
+      echo ""
+      echo "For manual setup instructions, see: "
+      echo "https://github.com/microsoft/autogen/blob/main/python/README.md#setup"
+    exit 1
+  fi
+else
+  echo "All required tools are installed."
+fi